106 



THE LIAS AMMONITES. 



examined on five different occasions, have presented some local differences, partly laid 

 bare in the vi^orking, partly by waste of the coast." The alternations of shale and iron- 

 stone, with sandy shale forming the Ironstone series or Spinatus-heds, and the laminated 

 sandstone shale, with occasional ironstone balls, forming the Marlstone series or 

 Mar(/aritatus-heds, are well seen in this section, which is intended to give a fair average 

 idea of the whole when made in 1867. 



Fig. 4. — Section east of Sfait/ies Harbour, Yorh/iire Coast. 



Ft. In. 



Ironstone Series 



or 

 Spinatus-heds 



(Hard-bed shale 

 Ironstone... 



Shale 



Ironstone, with shale 

 partings and five iron- 

 stone beds in shale . 



Ironstone... 



Shale 



Ironstone... 



Sandy shale 



Ironstone... 



Sandy shale, with five 

 bands of scattered 

 ironstone nodules ... 



Marlstone Series 



or 

 Margaritatus- \ 

 beds 



Laminated sandstone 

 and shale, with occa- 

 sional ironstone balls 



Sandstone more solid, 

 and forming scar and 

 part of cliff east of 

 Staithes Harbour ... 



"?f^ir^nr-"^?Mi 



'J \*^t^t'* JM^" k J, •>« 



^^B "Sir 





/_^Y 



2' 



3" 





1' 



6" 





4' 



6" 



Pecten csquivatvit. 



5' 



6" 





2' 



0' 



Belemnite-beds. 



1' 



3" 



Pecten calvus. 



7' 



0"- 





2' 



0" 







.J 



Few Belemnites. 



10' 



2' 0"J 



25' 0" Protocardium truncaium. 



Belemnites near the base. 



20' 0" 



Gryphwa cymbium. 

 20' 0" Protocardium truncaium. 



" In the above section the Ironstone courses above the Marlstone are in all 16 feet 

 6 inches thick, and the shales above and below them (including the sandy portions 

 below) are 45 feet 6 inches (including the hard-bed shale above the thicker Ironstones, 

 50 feet 6 inches). Total from 62 to 67 feet. The shales are in some places 8 to 10 

 feet thicker." ^ 



1 'Yorkshire Coast,' p. 156. 



